Petitioners challenge their convictions on the ground that they were obtained in violation of the Ex Post Facto Clause of the United States Constitution, Art. I, 10.

Prior to " Ky.Rules Crim.Proc. 9.62. Effective that date, the rule was repealed, and thereafter convictions in Kentucky could legally be based upon the uncorroborated testimony of accomplices. [ Murphy v. Kentucky
465
U.S. 1072
(1984) ][1072-Continued.]

After repeal of the rule, petitioners in these two unrelated cases were tried for crimes that had been committed prior to the repeal. In each case, the trial court rejected the defendant's request for an instruction to the effect that the jury could not convict on the uncorroborated testimony of an accomplice. The Kentucky Supreme Court affirmed both convictions over the claim that application of the new rule violated the Ex Post Facto Clause. Murphy v. Commonwealth, 652 S.W.2d 69 ( Ky.1983); Phillips v. Commonwealth, 655 S.W.2d 6 (Ky.1983).

The Supreme Court of Kentucky held that the change was not ex post facto, because it was merely a change in procedure. The change did not decrease the amount of evidence necessary to convict, but merely removed an impediment to the credibility of

certain witnesses. Murphy v. Commonwealth, supra, at 72. In reaching its conclusion, the Kentucky court relied upon this Court's decision in Hopt v. Utah,
110
U.S. 574
(1884), which upheld retroactive application of a statute eliminating the ineligibility of convicted felons as witnesses. The Court in Hopt stated:

Any statutory alteration of the legal rules of evidence which would authorize conviction upon less proof, in amount or degree, than was required when the offence was committed, might, in respect of that offence, be obnoxious to the constitu-
[465
U.S. 1072
, 1073]
tional inhibition upon ex post facto laws. But alterations which do not increase the punishment, nor change the ingredients of the offence or the ultimate facts necessary to establish guilt, but- leaving untouched the nature of the crime and the amount or degree of proof essential to conviction-only remove existing restrictions upon the competency of certain classes of persons as witnesses, relate to modes of procedure only, in which no one can be said to have a vested right, and which the State, upon grounds of public policy, may regulate at pleasure.
110
U.S., at 590
.

The Kentucky court found Hopt to be dispositive, stating that "[t]he rule change was simply a procedure change which made a certain class of witnesses competent without corroboration." 652 S.W.2d, at 73.

Other courts, however, have come to precisely the opposite conclusion . For example, the United States Court of Appeals for the Third Circuit, distinguishing Hopt, has held that repeal of a statute requiring corroboration of accomplice testimony "reduces the amount of proof necessary for conviction" and therefore cannot constitutionally be applied retroactively. Government of the Virgin Islands v. Civil, 591 F.2d 255, 259 (3 Cir.1979). See also Bowyer v. United States, 422 A.2d 973 (D.C.App. 1980) (abolition of requirement of corroboration of testimony of sex-crime victims); State v. Byers, 102 Idaho 159, 627 P.2d 788 (1980) (same). Indeed, in Commonwealth v. Brown, 619 S.W.2d 699 (Ky.1981), which was overruled by Murphy v. Commonwealth, supra, the Kentucky Supreme Court itself reached a result contrary to the one it reached in these two cases.

Because of the evident confusion among lower courts concerning the application of the Ex Post Facto Clause to changes in rules of evidence and procedure-and because some 15 other states have accomplice- corroboration requirements that they may choose to abolish, see App. to Pet. for Cert. in No. 83-5352, p. 15-we disregard our duty when certiorari is denied. Respectfully, I dissent.